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<a name="AMD-GCN-Options-1"></a>
<h4 class="subsection">3.19.3 AMD GCN Options</h4>
<a name="index-AMD-GCN-Options"></a>

<p>These options are defined specifically for the AMD GCN port.
</p>
<dl compact="compact">
<dd>
<a name="index-march-1"></a>
<a name="index-mtune-1"></a>
</dd>
<dt><code>-march=<var>gpu</var></code></dt>
<dt><code>-mtune=<var>gpu</var></code></dt>
<dd><p>Set architecture type or tuning for <var>gpu</var>. Supported values for <var>gpu</var>
are
</p>
<dl compact="compact">
<dt>&lsquo;<samp>fiji</samp>&rsquo;</dt>
<dd><p>Compile for GCN3 Fiji devices (gfx803).
</p>
</dd>
<dt>&lsquo;<samp>gfx900</samp>&rsquo;</dt>
<dd><p>Compile for GCN5 Vega 10 devices (gfx900).
</p>
</dd>
<dt>&lsquo;<samp>gfx906</samp>&rsquo;</dt>
<dd><p>Compile for GCN5 Vega 20 devices (gfx906).
</p>
</dd>
<dt>&lsquo;<samp>gfx908</samp>&rsquo;</dt>
<dd><p>Compile for CDNA1 Instinct MI100 series devices (gfx908).
</p>
</dd>
<dt>&lsquo;<samp>gfx90a</samp>&rsquo;</dt>
<dd><p>Compile for CDNA2 Instinct MI200 series devices (gfx90a).
</p>
</dd>
</dl>

<a name="index-msram_002decc"></a>
</dd>
<dt><code>-msram-ecc=on</code></dt>
<dt><code>-msram-ecc=off</code></dt>
<dt><code>-msram-ecc=any</code></dt>
<dd><p>Compile binaries suitable for devices with the SRAM-ECC feature enabled,
disabled, or either mode.  This feature can be enabled per-process on some
devices.  The compiled code must match the device mode. The default is
&lsquo;<samp>any</samp>&rsquo;, for devices that support it.
</p>
<a name="index-mstack_002dsize"></a>
</dd>
<dt><code>-mstack-size=<var>bytes</var></code></dt>
<dd><p>Specify how many <var>bytes</var> of stack space will be requested for each GPU
thread (wave-front).  Beware that there may be many threads and limited memory
available.  The size of the stack allocation may also have an impact on
run-time performance.  The default is 32KB when using OpenACC or OpenMP, and
1MB otherwise.
</p>
<a name="index-mxnack"></a>
</dd>
<dt><code>-mxnack</code></dt>
<dd><p>Compile binaries suitable for devices with the XNACK feature enabled.  Some
devices always require XNACK and some allow the user to configure XNACK.  The
compiled code must match the device mode.  The default is &lsquo;<samp>-mno-xnack</samp>&rsquo;.
At present this option is a placeholder for support that is not yet
implemented.
</p>
</dd>
</dl>




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